rcutorture: Don't compare ptr with 0

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 31dea01..0249800 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -1749,7 +1749,7 @@
 	barrier_cbs_wq =
 		kzalloc(n_barrier_cbs * sizeof(barrier_cbs_wq[0]),
 			GFP_KERNEL);
-	if (barrier_cbs_tasks == NULL || barrier_cbs_wq == 0)
+	if (barrier_cbs_tasks == NULL || !barrier_cbs_wq)
 		return -ENOMEM;
 	for (i = 0; i < n_barrier_cbs; i++) {
 		init_waitqueue_head(&barrier_cbs_wq[i]);